Mississippi Code Title 27. Taxation and Finance § 27-7-35

(1) Every fiduciary, except a receiver appointed by authority of law in possession of part only of the property of an individual, shall make a return under oath for any individual, trust or estate for whom he acts, and for every trust or estate when the beneficiary is a nonresident, and shall state therein that he has sufficient knowledge of the affairs of the individual, trust or estate for which returns are made to enable him to make the return, and that, to the best of his knowledge and belief, the return is correct.

(2) Any fiduciary required to make returns shall be subject to all the provisions of this article which apply to individuals but shall not be required to file quarterly estimates of income tax.

(3) A fiduciary taxable year is required to be the same for Mississippi income tax purposes as determined for Federal income tax purposes.

(4) In the case of a fiduciary, each beneficiary that would otherwise be required to include more than twelve (12) months of income in a single taxable year may elect to include such excess of income in one (1) year or ratably over a period of four (4) taxable years.